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1、第35卷第9期儀器儀表學報V01.35No.92014年9月ChineseJournalofScientificInstrumentSep.2014電磁波隨鉆測量干擾信號消除算法研究術龍玲,陳慶,劉飛(1.西南民族大學電氣信息工程學院成都610041;2.中國地質大學(武漢)構造與油氣資源教育部重點實驗室武漢430074;3.華中科技大學電氣與電子工程學院武漢430074;4.川慶鉆探工程有限公司鉆采工程技術研究院廣漢618300)摘要:電磁波隨鉆測量(EM.MWD)是一種以電磁波形式實現地層傳輸的無線隨鉆測量技術,對井場隨鉆測
2、量實測的信號噪聲進行分析,發(fā)現接收噪聲中的主要干擾成分是來自工頻的諧波干擾。為消除工頻信號對于地面接收到的隨鉆測量信號的干擾,提出了一種基于正弦波參數估計的諧波干擾消除算法。該算法首先對干擾諧波參數進行估計,然后重構干擾諧波信號,并從接收信號中減去干擾信號,該過程迭代進行,直到接收信號中有效信號能量占到50%以上。經過仿真測試和實際實驗驗證,該方法有效的消除諧波干擾,最大程度上減小了有效信號的失真,并大大地提高了接收信號的信噪比。關鍵詞:電磁波隨鉆測量;正弦波參數估計;諧波干擾中圖分類號:TP29TN98TH89文獻標識碼:A國
3、家標準學科分類代碼:510.99ResearchoneliminatinginterferencesignalalgorithmofEM-MWDLongLing,ChenQing一,LiuFei(J.CollegeofElectrical&InformationEngineering,SouthwestUnivemi~forNationalities,Chengdu610041,China;2.KeyLaboratoryofTectonicsandPetroleumResources,Min~tryofEducation,Chi
4、naUnwemityofGeosciences,Wuhan釕DD,China;3.SchoolofElec—tricalandElectronicEngineering,HuazhongUniversityofScienceandTechnology,Wuhan鉗DD74,China;4.DrillingandProductionTechnologyResearchInstitute,ChuanqingDrillingEngineeringCo.,Ltd.,CNPC,Guanghan618300,China)Abstract:E
5、lectromagneticmeasurementwhiledrilling(EM—MWD)isakindofwirelessmeasurementwhiledrillingwithelectromagneticwave.Thenoiseinthemeasuredwel1.sitesignaliSanalyzed.andtheanalysisresultindicatesthatthemaindisturbancefactorinthere—ceivednoiseistheharmonicinterferencefromthep
6、owerfrequency.InordertoeliminatetheinterferencetothesignalofEM-MWD,thispaperexploresaharmonicinterferenceeliminationapproachbasedonsine—waveparameterestimation.Thismethodfirstestimatestheharmonicinterferenceparameters,andthenrestructurestheharmonicinterferencesignal,
7、andthereconstructedharmonicinterferencesignalissubtractedfromthereceivedsignal;thisprocessisperformediterativelyuntiltheefectivesignalenergyreachesmorethan50%inthereceivedsigna1.Simulationtestandactualexperimentwereconducted,theresultsshowthatthisapproachefectivelyel
8、iminatestheharmonicinterference,minimizesthedistortionoftheeffectivesignal,andgreatlyimprovesthesignaltonoiseratioofthereceivedsign